there seem to be a bunch of common problems that lots of people have; not limited to any particular model, just common to the RS Clio 2s
engine mounts, leaking dampers, snapped springs, 'loose' top mounts, corroded exhausts, tatty steering wheels, gearbox bother (if you're unlucky), erm.. probably enough there already, but doubtless a few other things
nowhere near as strong (mechanically) as a good GTi IMO. engines seem good though, which is just as well